1781977844812 has 24 divisors (see below), whose sum is σ = 3402026852112. Its totient is φ = 809973465600.

The previous prime is 1781977844809. The next prime is 1781977844819. The reversal of 1781977844812 is 2184487791871.

It is not an unprimeable number, because it can be changed into a prime (1781977844819) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1927012 + ... + 2697652.

It is an arithmetic number, because the mean of its divisors is an integer number (141751118838).

Almost surely, 2^{1781977844812} is an apocalyptic number.

It is an amenable number.

1781977844812 is a deficient number, since it is larger than the sum of its proper divisors (1620049007300).

1781977844812 is a wasteful number, since it uses less digits than its factorization.

1781977844812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823209 (or 823207 counting only the distinct ones).

The product of its digits is 50577408, while the sum is 67.

The spelling of 1781977844812 in words is "one trillion, seven hundred eighty-one billion, nine hundred seventy-seven million, eight hundred forty-four thousand, eight hundred twelve".